Primaluna and Rogue

use gloves when handling any of the tubes , large or small
The Magnum should have the KT90 powertubes which with the larger power supply allows for the unit generate 90 wpc - these are tubes that get biased . The small tubes are all signal stage tubes

Donjr - any idea what brand 12 au7's and ax7's are coming along with your Magnum?

Donjr - the names should be on the glass - brands such as JJ, EH (electron harmonis) , sovtek are new production, those like RCA, Sylvania, Telefunken are NOS - Mullards and Tungsols can be either - here's a couple of links - TubeDepot sells both - new & NOS , Brent jesse sells NOS -PS I'm not affiliated with either just a customer of both - If it doesn't have NOS you can get them without spending a fortune and get a big difference to my ears - likewise you can spend a lot on NOS if you have the bucks

http://tubedepot.com/12ax7.html

http://tubedepot.com/12au7.html

http://www.audiotubes.com/12ax7.htm

http://www.audiotubes.com/12au7.htm

Donjr when they shipped me my Magnum all of the signal tubes were Sylvania's , might want to just give them a call and ask

I would check the bias just to be sure each tube isset right - its simply and easy on the amp to do - let the amp warm up for 30 minues with the volume turned down then check it - after that check it 1x a month